An attorney would have to review your settlement agreement to answer your question. However, it is likely that you accepted a settlement in full settlement of all claims for the injuries. Thus, it is most likely that you cannot "re-open" your personal injury claim.
The attorney is acting as an escrow agent. He or she cannot release the money unless both parties agree to the release. If the sellers refuse to release the money, then the attorney must hold the money until the dispute is resolved - or he or she may deposit the funds into court once a court action is initiated.
You should speak to your real estate attorney about what your options are.
If the attorney took the case on a contingency fee arrangement, that means he or she must front the fees and many hours of his or her time working on the matter. Sometimes, what seems like a good case, turns into a case that clearly won't win or has little value. Further, in some instances, a client may testify to one set of facts when the client previously told the attorney a completely contradictory story. In those situations, the attorney may seek to withdraw rather than spend thousands of...